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1.
A fifth of a gallon of liquor. Technically it is around 757mL, but fifths are sold in bottles containing 750mL.
Terry was sippin' on his fifth of Taaka
by Terry Samson December 02, 2003
 
2.
750 milliters of a liquid, the term is almost always used in reference to hard alcohol. (i.e. gin, vodka, rum, whiskey, triple sec, etc)
I have a fifth of Jack Daniels in the freezer. Its safe because the high alcohol content keeps it from freezing.
by Ryan Thompson July 06, 2004
 
3.
1 a fifth of a gallon of liquor aka 26 ounces or two-six and 750mL
2 a gun more specifically refering to a .45
Im off a fifth of that hennessy
Im strapped with my fifth
I got my four fifth
by Chrome February 22, 2006
 
4.
Noun - A nickname for a person who you've slept with that you needed a "fifth" of liquor to sleep with and you want to plead the "fifth" the next day.
I hit it with that guy across the bar, totally a fifth.
by gobird November 20, 2009
 
5.
an adjective used to describe a boy whose hottness level is beyond that of alstat
rooted from johnathan o'callaghan V (the fifth), lead singer of The Maine.
commonly used to describe boys with nice hair in bands that wear tight pants.
mmm dat boi is soooooo fifth!

johnohh was looking particularly fifth tonight at the show!
by tALOR! May 26, 2008
 
6.
aa adjective used to describe a boy whose hottness level is beyond that of alstat
rooted by johnathan o'callaghan v (the fifth), lead singer of The Maine.
commonly used to describe boys with nice hair in bands that wear tight pants.
mmm dat boi is soooooo fifth!

johnohh was looking particularly fifth tonight at the show!
by tALOR! May 26, 2008